Same as the Shuttles, they were all designed to do it.

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Because if you decided to tilt the Saturn V at an angle on the launchpad it'd fall over and that would be bad.

>Why wasn’t the module adjusted on the launch pad so this wasn’t necessary?

Several reasons.

The launch pad/tower infrastructure (elevators, hold down clamps, umbilicals) are designed to mate with the launch vehicle in a specific orientation. But even if you could rotate the whole kit and caboodle, it wouldn't help:

For launches with non-instantaneous launch windows, such as the Apollo missions, the trajectory the vehicle will take once it clears the launch tower varies depending on when liftoff actually occurs. Therefore, there is no pad orientation which would eliminate the need for the roll maneuver in every case.

its easier to roll the vehicle in the air than to build the whole launch infrastructure on a turntable.

it is possible to "rotate the whole kit". i think the russians are still doing it, or at least were doing it that way.

Possible but not worth the cost in retrofit when they can just roll the vehicle.

Interesting. It appears that rotation of Soyuz launch vehicles was necessary until the Soyuz 2.a which first launched in 2004.

Guess this answer didn't solve your issue?

Interestingly, some of the soviet rockets did exactly that. The whole launch pad could rotate to pre-align the launch.

https://www.youtube.com/watch?v=kB-GKvdydho

Because rolling the vehicle in flight is trivially simple, while attempting to roll entire launch pad to be "properly" oriented at the moment when launch actually happens is very hard.

Was hoping for some classic Soviet footage, still good content but a tad disappointed

you will not go to space today

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So the roll angle varies depending on the time of the launch? I never knew that.

It's the flight azimuth that changes as the Earth rotates during the launch window. The rocket rolls to align itself to its flight azimuth so its flight path then becomes a simple pitch program.